/** Calculate the minimum and preferred size for every row and column. */
private void calculateSizes() {
Dimension dim[] = new Dimension[child.size()];
for (int i = 0; i < dim.length; i++) dim[i] = child.get(i).widget.getMinimumSize();
minRowSize = calculateRequiredSizes(dim, true);
minColSize = calculateRequiredSizes(dim, false);
for (int i = 0; i < dim.length; i++) {
ChildInfo info = child.get(i);
LayoutInfo layout = (info.layout == null ? defaultLayout : info.layout);
dim[i] = layout.getPreferredSize(info.widget);
}
prefRowSize = calculateRequiredSizes(dim, true);
prefColSize = calculateRequiredSizes(dim, false);
}
/**
* Set the number of columns in this FormContainer. If this increases the number of columns, the
* new columns will have weights of 1.0 by default. If this decreases the number of columns, any
* child Widgets that extend beyond the last column will be removed.
*/
public void setColumnCount(int columns) {
double newWeight[] = new double[columns];
if (columns > colWeight.length) {
for (int i = 0; i < colWeight.length; i++) newWeight[i] = colWeight[i];
for (int i = colWeight.length; i < newWeight.length; i++) newWeight[i] = 1.0;
} else {
for (int i = child.size() - 1; i >= 0; i--) {
ChildInfo info = child.get(i);
if (info.x + info.width > columns) remove(i);
}
for (int i = 0; i < newWeight.length; i++) newWeight[i] = colWeight[i];
}
colWeight = newWeight;
}
/**
* Set the number of rows in this FormContainer. If this increases the number of rows, the new
* rows will have weights of 1.0 by default. If this decreases the number of rows, any child
* Widgets that extend beyond the last row will be removed.
*/
public void setRowCount(int rows) {
double newWeight[] = new double[rows];
if (rows > rowWeight.length) {
for (int i = 0; i < rowWeight.length; i++) newWeight[i] = rowWeight[i];
for (int i = rowWeight.length; i < newWeight.length; i++) newWeight[i] = 1.0;
} else {
for (int i = child.size() - 1; i >= 0; i--) {
ChildInfo info = child.get(i);
if (info.y + info.height > rows) remove(i);
}
for (int i = 0; i < newWeight.length; i++) newWeight[i] = rowWeight[i];
}
rowWeight = newWeight;
}
/**
* Layout the child Widgets. This may be invoked whenever something has changed (the size of this
* WidgetContainer, the preferred size of one of its children, etc.) that causes the layout to no
* longer be correct. If a child is itself a WidgetContainer, its layoutChildren() method will be
* called in turn.
*/
public void layoutChildren() {
if (minColSize == null) calculateSizes();
Dimension size = getComponent().getSize();
int rowPos[] = calculatePositions(minRowSize, prefRowSize, rowWeight, size.height);
int colPos[] = calculatePositions(minColSize, prefColSize, colWeight, size.width);
Rectangle cell = new Rectangle();
for (int i = 0; i < child.size(); i++) {
ChildInfo info = child.get(i);
LayoutInfo layout = (info.layout == null ? defaultLayout : info.layout);
cell.x = (info.x == 0 ? 0 : colPos[info.x - 1]);
cell.y = (info.y == 0 ? 0 : rowPos[info.y - 1]);
cell.width = colPos[info.x + info.width - 1] - cell.x;
cell.height = rowPos[info.y + info.height - 1] - cell.y;
info.widget.getComponent().setBounds(layout.getWidgetLayout(info.widget, cell));
if (info.widget instanceof WidgetContainer) ((WidgetContainer) info.widget).layoutChildren();
}
}
/** Get a Collection containing all child Widgets of this container. */
public Collection<Widget> getChildren() {
ArrayList<Widget> list = new ArrayList<Widget>(child.size());
for (int i = 0; i < child.size(); i++) list.add(child.get(i).widget);
return list;
}
/** Get the number of children in this container. */
public int getChildCount() {
return child.size();
}
/**
* Get the index of a particular Widget.
*
* @param widget the Widget to locate
* @return the position of the Widget within this container
*/
public int getWidgetIndex(Widget widget) {
for (int i = 0; i < child.size(); i++) if (child.get(i).widget == widget) return i;
return -1;
}
/** Remove all child Widgets from this container. */
public void removeAll() {
getComponent().removeAll();
for (int i = 0; i < child.size(); i++) removeAsParent(child.get(i).widget);
child.clear();
invalidateSize();
}